Intermediate shaft assembly for new energy speed reducer and new energy automobile speed reducer

Abstract

The utility model discloses an intermediate shaft assembly for a new energy speed reducer, which comprises an intermediate shaft bull gear and an intermediate shaft, an external spline is arranged on the intermediate shaft, an internal spline matched with the external spline is arranged on the intermediate shaft bull gear, the external spline is a helical tooth spline, and the internal spline is a straight tooth spline. According to the intermediate shaft assembly for the new energy speed reducer, the matching reliability of the spline of the intermediate shaft is improved, the risk that the spline is loosened due to the impact of axial force is reduced, and the connecting reliability of the large gear of the intermediate shaft and the intermediate shaft can be improved. The utility model further discloses the new energy automobile speed reducer.

Description

Technical Field

[0001] The utility model belongs to the technical field of speed reducers. Specifically, the utility model relates to an intermediate shaft assembly for a new energy speed reducer and a new energy vehicle speed reducer. Background Art

[0002] With the increasing market share of new energy vehicles, new energy reducers, as an alternative to traditional automotive transmissions, have also seen significant development. This, however, has also led to increasingly stringent requirements for these reducers. Currently, the internal gear structure of a single-speed new energy reducer typically consists of an input shaft assembly, an intermediate shaft assembly, and a differential assembly. The intermediate shaft assembly consists of two gears: a large gear meshing with the input shaft gear, and a small gear meshing with the differential's main reduction gear. To save costs, the intermediate shaft assembly typically utilizes a split design, consisting of a large intermediate shaft gear and an intermediate shaft, both assembled together using a spur spline interference fit.

[0003] The rapid changes in speed and torque in new energy reducers, as well as the feeding mode, will bring great axial force impact to the gear shaft in the reducer. In particular, the intermediate shaft spur spline will often bring the risk of loosening under the impact of such axial force, thereby affecting the noise, performance and even function of the reducer.

[0004] Chinese patent application number 202110613469.2 discloses an intermediate shaft assembly of a reducer, which adds a one-way clutch as a disconnect mechanism, which can achieve power connection in one direction and power disconnection in the other direction. The intermediate shaft assembly of the reducer includes an intermediate shaft, a bushing, an external gear and a one-way clutch. The bushing is spline-connected to the intermediate shaft. The external gear is arranged corresponding to the bushing. The one-way clutch is arranged between the bushing and the external gear, the bushing serves as the inner raceway of the one-way clutch, and the external gear serves as the outer raceway of the one-way clutch. When the external gear rotates in a first direction, the one-way clutch locks to drive the intermediate shaft to rotate through the bushing. When the external gear rotates in a second direction, the one-way clutch does not lock, allowing the external gear to rotate freely. The first direction is opposite to the second direction.

[0005] It is hoped to provide an improved intermediate shaft assembly for a new energy reducer, particularly with regard to how to improve the reliability of the connection between the intermediate shaft gear and the intermediate shaft. Utility Model Content

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an intermediate shaft assembly for a new energy speed reducer, the purpose of which is to improve the reliability of the connection between the intermediate shaft gear and the intermediate shaft.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an intermediate shaft assembly for a new energy reducer, including an intermediate shaft gear and an intermediate shaft, the intermediate shaft is provided with an external spline, and the intermediate shaft gear is provided with an internal spline that cooperates with the external spline, the external spline is a helical spline, and the internal spline is a straight spline.

[0008] The tooth profiles of the external spline and the internal spline are involute.

[0009] The helical angle of the helical teeth of the external spline is 8'-12'.

[0010] The intermediate shaft comprises an intermediate shaft body and a pinion gear arranged on the intermediate shaft body, and the intermediate shaft body is provided with an external spline.

[0011] The diameter of the pinion gear is smaller than the diameter of the intermediate shaft gear.

[0012] The utility model also provides a new energy vehicle reducer, comprising the intermediate shaft assembly for the new energy reducer.

[0013] The intermediate shaft assembly for the new energy reducer of the utility model increases the reliability of the intermediate shaft spline matching, reduces the risk of the spline loosening due to the impact of axial force, and can improve the reliability of the connection between the intermediate shaft gear and the intermediate shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] This manual includes the following drawings, which show the following contents:

[0015] Figure 1 This is a structural diagram of the intermediate shaft assembly used for the new energy reducer of the utility model;

[0016] Figure 2 This is a structural diagram of the intermediate shaft and the intermediate shaft gear;

[0017] Figure 3 It is an enlarged schematic diagram of the external spline helical teeth of the intermediate shaft;

[0018] Figure 4 This is a schematic diagram of the intermediate shaft assembly press-fit;

[0019] Figure 5 It is a schematic diagram of the axial force impact on the intermediate shaft;

[0020] Figures 1 to 5 The inventor needs to modify it into a pure 2D line drawing

[0021] The following are marked in the figure:

[0022] 1. Intermediate shaft assembly; 2. Intermediate shaft; 3. Intermediate shaft gear; 4. External spline; 5. Assembly press force; 6. Assembly support point; 7. Axial force. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the specific implementation methods of the present invention by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and to facilitate its implementation.

[0024] like Figures 1 to 5 As shown, the utility model provides an intermediate shaft assembly for a new energy reducer, including an intermediate shaft gear 3 and an intermediate shaft 2, an external spline 4 is provided on the intermediate shaft 2, and an internal spline that cooperates with the external spline 4 is provided on the intermediate shaft gear 3. The external spline 4 is a helical spline, and the internal spline is a straight spline.

[0025] Specifically, if Figures 1 to 3 As shown, the intermediate shaft gear 3 and intermediate shaft 2 are coaxially arranged, and the tooth profiles of the external splines 4 and internal splines are involute. The external splines 4 on the intermediate shaft are involute helical splines, and the internal splines set at the center of the intermediate shaft gear 3 are involute spur splines.

[0026] Preferably, the helical angle of the helical teeth of the external spline 4 is 8'-12'.

[0027] like Figures 1 to 3 As shown, the intermediate shaft 2 includes an intermediate shaft body and a pinion gear disposed on the intermediate shaft body. The intermediate shaft body is provided with an external spline 4, which is adjacent to the pinion gear. The diameter of the pinion gear is smaller than the diameter of the intermediate shaft gear 3.

[0028] Preferably, the heat treatment methods for the four teeth of the inner and outer splines are carburizing, quenching and tempering or carbonitriding, quenching and tempering.

[0029] The intermediate shaft gear 3 and the intermediate shaft are not allowed to produce plastic deformation during the spline press-fitting process, that is, the spline surface stress is less than the yield stress of the material.

[0030] When the external splines 4 of the intermediate shaft 2 are pressed into the internal splines of the intermediate shaft gear 3, the helical teeth of the external splines 4 of the intermediate shaft 2 cause significant elastic deformation during the press-in process. This deformation exerts a significant positive pressure on the mating surface of the splines, generating a high friction force. This greatly ensures the reliability of the spline fit and reduces the risk of spline loosening, thereby improving the reliability of the connection between the intermediate shaft gear 3 and the intermediate shaft 2. Furthermore, this helical spline fit provides a certain locking effect when the splines are subjected to axial force.

[0031] The intermediate shaft assembly of the above structure for the new energy reducer has the following advantages:

[0032] 1. Increased reliability of the intermediate shaft spline fit and reduced the risk of the spline loosening due to axial force impact;

[0033] 2. The intermediate shaft helical spline structure is pressed and assembled using cold pressing, which is beneficial to reducing process costs compared to the current mainstream hot pressing method.

[0034] The utility model also provides a new energy vehicle reducer, including the intermediate shaft assembly for the new energy reducer of the above structure. The intermediate shaft assembly for the new energy reducer can refer to Figures 1 to 5 Since the new energy vehicle reducer of the present invention includes the intermediate shaft assembly for the new energy reducer in the above embodiment, it has all the advantages of the intermediate shaft assembly for the new energy reducer.

[0035] The above description of the present invention is provided as an example, in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any application of the above-described concepts and technical solutions of the present invention to other situations without modification, are all within the scope of protection of the present invention.

Claims

1. The intermediate shaft assembly for the new energy reducer includes an intermediate shaft gear and an intermediate shaft, and is characterized by: The intermediate shaft is provided with an external spline, and the intermediate shaft gear is provided with an internal spline matched with the external spline. The external spline is a helical spline, and the internal spline is a straight spline.

2. The intermediate shaft assembly for the new energy reducer according to claim 1 is characterized in that: The tooth profiles of the external spline and the internal spline are involute.

3. The intermediate shaft assembly for the new energy reducer according to claim 1 is characterized in that: The helical angle of the helical teeth of the external spline is 8'-12'.

4. The intermediate shaft assembly for a new energy reducer according to any one of claims 1 to 3, characterized in that: The intermediate shaft comprises an intermediate shaft body and a pinion gear arranged on the intermediate shaft body, and the intermediate shaft body is provided with an external spline.

5. The intermediate shaft assembly for the new energy reducer according to claim 4 is characterized in that: The diameter of the pinion gear is smaller than the diameter of the intermediate shaft gear.

6. New energy vehicle reducer, characterized by: The intermediate shaft assembly for a new energy reducer comprises any one of claims 1 to 5.

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